On Tuesday 06 May 2008 07:40, Richard Hennessy wrote:
> "Floating-point operations are not exact, but they can be modeled as:
> fl( x op y ) = (1+D) (x op y)
> where |D| <= u, u is the unit round off or machine precision"
>
> I found this on the Internet and it is about running error analysis for
> numerical algorithms. I just want to know the value of u for big floats as
> a function of fpprec (as opposed to machine precision) since Maxima big
> floats are running in a virtual machine? Does anyone know how round off is
> handled with big floats.
Try something like this: http://netlib.org/blas/machar.f
--
Alexey Beshenov <al at beshenov.ru>
http://beshenov.ru/
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